TB Parts 88cc Big Bore Kit for Honda Z50/XR50/CRF50. Add some performance to your pit bike! High quality parts that you have come to expect from TB Parts. This is a bolt on kit with no case boring required. Comes with everything you need to install as shown. This is a 52mm bore - we also carry replacement pistons, rings, and gaskets for these kits. Bolt on some power and make your 50 way more fun to ride. We are including the TB high flow oil pump in this listing. It is recommended when installing any big bore to your 50. It saves a ton of time installing the oil pump at the same time since removing the cylinder is required to install the oil pump. 

Some key features of this kit:

• Lightweight aluminum cylinder with steel sleeve
• Cast in mounts on cylinder for aftermarket skid plates
• Oversized cooling fins on cylinder for efficient heat dissipation
• High compression 52mm piston with rings, pin, & clips
• Head/Base gasket kit, With exhaust gasket.
• High Flow Oil Pump included!
  

Fits:

• Honda Z50 1988-1999
• Honda XR50 All Years
• Honda CRF50 All Years

There are no installation instructions, but if you can replace your piston, you can install this kit as the parts are installed in the same manner as the OEM parts. However, its highly recommended that a professional install this kit and make sure its tuned and jetted properly.